Anything to keep the connectors from disconnecting from vibration. I just happen to use some cotton string wrapped around the connectors (after they are properly joined) lengthwise, tied off in a tight knot to hold them closed or joined, and a drop of CA on the knot to keep IT from coming undone. Dental floss.. kite string, cooking twine, anything like that will do. The string is good because it is cheap (inexpensive), and if carefully done, you can simply cut the string with an exacto knife and un-join the connectors.

The drawing below is crude, but it should show you what I mean.

CGr